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javaenumsenumset

Java EnumSet Syntax Assistance

I am just starting to learn Java and I'm working through a simple application that works with a deck of cards. Currently, I'm trying to instantiate a Suit class with an enum. I wanted to use the EnumSet functionality, but I'm really having trouble wrapping my head around what is going on here.

I have looked through several examples and I believe I'm just not fully comprehending the syntax.

Here's what I have so far. What I want to end up with is an EnumSet with the values of each Suit of Cards (clubs, diamonds, hearts, spades).

public class Suits {

    public enum Suit {
        CLUBS("Clubs"),
        DIAMONDS("Diamonds"),
        HEARTS("Hearts"),
        SPADES("Spades");
        private String displayText;


        Suit(String displayText) { 
            this.displayText = displayText;
        } 

        public String getDisplayText() {
            return this.displayText;
        }

    }

    final EnumSet<Suit> allSuits = EnumSet.allof(Suit.values());

}

I know that the syntax on the final EnumSet is wrong. I'm just not sure what exactly I am doing wrong. Any help is appreciated.

Solution

  • You should pass a Class<Suit> instance instead of a Suit[]:

    final EnumSet<Suit> allSuits = EnumSet.allOf(Suit.class);

    The method signature is allOf(Class<E> elementType).